Koji has an average build with pale skin and black puffy hair. Like his brother, he wears blue denim overalls with a blue t-shirt. In addition, he is the only one of his siblings who wears glasses like their father.
As shown in one scene of Beyblade Burst, Koji is the second child out of all his siblings, with Hoji being the only one ahead of him.
- He uses a blue Garuda Layer, which cannot be obtained in real life.
- Before Beyblade Burst Turbo, Koji appeared in cameos twice. The first time with his siblings in Beyblade Burst and the second time watching Valt and Shu's final battle in Beyblade Burst Evolution.